1.2.1.54 2-Carboxy-2'-hydroxy-5'-sulfoformazylbenzene zincon 19914 1.2.1.54 diethyldithiocarbamate - 373 1.2.1.54 Ferron - 44130 1.2.1.54 N-ethylmaleimide - 49 1.2.1.54 o-phenanthroline - 239 1.2.1.54 p-chloromercuribenzoate - 43